We describe some recent developments in the POPAN system for the analysis o
f mark-recapture data from JoIly-Seber (JS) type experiments and how this s
ystem applies to the analysis of banding data. We discuss some of the extra
data requirements of JS studies, which provide estimates of abundance and
entry/birth rates, over survival (CIS) studies. We discuss how POPAN implem
ents a unified likelihood approach using a constrained maximization and sho
w how this differs from a design-matrix approach used in CIS software. We i
llustrate the application of constraints and covariate models across groups
with some examples drawn from the banding literature, including an example
with age-class groups and we describe some of the resources in POPAN for c
arrying out standard tests for goodness-of-fit.